New pc not post-ing, when only cpu is connected switches off after 1-2seconds

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Oct 21, 2014
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Just built my first PC and when all put together would boot but not post. No beeps and no signal to monitor. Took everything apart, only CPU connected to motherboard, CPU fan comes on for about 1-2 seconds and then switches off. Result is the same with 0,1 or 2 sticks of RAM. All power supplies connected. Tried with a different PSU still the same. Is there something I'm missing?
Specs:
ASUS M5A97 R2.0 motherboard
AMD FX6300 CPU and stock fan
Sapphire R9 280
Hyper X 2x4Gb 1866 RAM
WD Blue 1tb HDD
Corsair CX600 PSU
 

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Oct 21, 2014
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The motherboard would not POST when everything was connected. The RAM was in the places the motherboard manual specified
 

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Oct 21, 2014
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It requires a recommended minimum of 500W, and even so the rest of my system is not at all power hungry.
http://www.sapphiretech.com/presentation/product/?cid=1&gid=3&pid=2194&lid=1#